Ancillary cracking of heavy oils in conjuction with fcc unit...

C - Chemistry – Metallurgy – 10 – G

Patent

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C10G 11/00 (2006.01)

Patent

CA 2657615

The production of light hydrocarbons consisting of ethylene, propylene, butylenes, and of gasoline is enhanced by introducing a heavy oil feedstream derived from an external source into an ancillary downflow reactor that utilizes the same catalyst composition as an adjacent FCC unit for cracking the heavy oil and withdrawing the desired lighter hydrocarbon reaction product stream from the downflow reactor and regenerating the catalyst in the same regeneration vessel that is used to regenerate the spent catalyst from the FCC unit. The efficiency of the recovery of the desired lighter olefinic hydrocarbons is maximized by limiting the feedstream to the downflow reactor to heavy oils that can be processed under relatively harsher conditions, while minimizing production of undesired by-products.

L'invention concerne la production d'hydrocarbures légers consistant en éthylène, propylène, butylènes, et essence qui se trouve améliorée par l'introduction d'un courant d'alimentation en huile lourde dérivé d'une source externe dans un réacteur en aval auxiliaire utilisant la même composition catalytique qu'une unité FCC adjacente pour le craquage de l'huile lourde et retirant le produit de réaction hydrocarbure plus léger désiré du réacteur en aval puis régénérant le catalyseur dans la cuve de régénération servant à régénérer le catalyseur usagé de l'unité FCC. L'efficacité de la récupération des hydrocarbures oléfiniques plus légers désirés est optimisée en limitant le courant d'alimentation du réacteur en aval aux huiles lourdes que l'on peut traiter dans des conditions relativement plus sévères, tout en minimisant la production de produits dérivés indésirables.

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